The B8.5 Audi S4 featuring a supercharged 3.0t engine makes in incredibly unique sound. Unfortunately, the factory exhaust is far too quiet for an enthusiast's taste. Equipped with downpipes and a Valvetronic Designs Valved Catback, this S4 unleashes its full sound and power potential. Put yourself in the driver's seat and enjoy the supercharger's incredible whine!.

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